All that needs to be set up is the recipient policy and additional SMTP addresses on each user.

Default policy: add the extra domain names.
This will add the domain you are receiving emails for onto each user. If you do not want to have this domain on your users, unselect the box, or make a policy and attach it to only a selection.

the one from that list most likely to cause the issue you describe is an incorrect spf record for abc.com. if you only ever get issues when sending as abc.com then make sure the spf txt record for abc.com has your sending server ip address(es) listed. you can check by going to command prompt and typing

nslookup -q=txt abc.com

make sure the record has your domain. if no record exists then this is not the cause and I suspect there may be more to the problem.
also make sure the rdns matches the ehlo greeting of sending server.
shaun

If you don't have an spf record at all for abc.com then you shouldn't be getting SPF errors when sending. Are you 100% sure there is no SPF record?

You run:

nslookup -q=txt abc.com

and nothing is returned?

You shouldn't need to setup a SPF record for abc.com. Is the mail definitely going out as abc and not 123, and is the IP for the 123 SPF definitely correct? Check an email header of outgoing message (send to gmail or something and view internet headers) and make sure IP address of sending server is correct in ANY EXISTING SPF RECORD.

Shaun

0

Featured Post

Managing Active Directory does not always have to be complicated. If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

This article aims to explain the working of CircularLogArchiver. This tool was designed to solve the buildup of log file in cases where systems do not support circular logging or where circular logging is not enabled

In this video we show how to create an email address policy in Exchange 2013. We show this process by using the Exchange Admin Center.
Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center.
Navigate to the Mail Flow…

To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center.
Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center.
Navigate to the Servers >> Certificates…